Water-meter



K. MORI.

WATER METER.

APPLICATION man um. 24. 1911.

Patented Jul 12, 1921.

2 SHEETS-SHEET I.

' ATTORNEY K. MORI.

WATER METER.

APPLICATION FILED JAN. 24,1917.

Patented July 12, 1921.

2 SHEETSSHEET 2.

ATTORNEY KATSUKICHI MORI, TOKYO, JAPAN.

WATER-METER.

Specification of Letters Patent.

Patented July 12, 1921 Application filed January 24, 1917. Serial No. 144,114.

To all whom it may concern Be it known that I, IiATSUKIOHl Moni, subject of the Emperor of Japan, residing at No. 19 Ginza Itchome, Kyobashi-ku, Tokyo, oapan, have invented new and useful Improvements in Nator-Meters, of which the following is a specification.

This invention relates to a water meter consisting of one main pipe, which is to be connected to the outlet end of the water supply pipe, and has two different cross sectional areas, and one or two glass or metal tubes oismall bore, one end of which is inserted into the above mentioned main pipe, while the other end is either left open or connected together, the water flow through the main pipe being calculated from the measurement of the flow through the branch tubes. The object of the invention lies in measuring the flow accurately at a verysmall construction cost. The meter is constructed in two forms as follows Form A water mcter.-In the 'meterof this "form only one branch tube'is employed, with one end of it inserted into that part oi the main pipe where the'sectional area is large, while the other end is left free, so that a portion of thewater flowing through the main pipe isallowed to discharge from this free end, and'by measurement of this discharge the flow through the main pipe is calculated.

Form B water meter.-In the meter of this form two branch'tubes are employed,

with one end of each tube respectively inserted into the main pipe at the points cor responding to the two different sectional areas, while" the other ends are connected together witha small tube, and, by forcing an air bubble into the branch tubes and measuring the motion of this air bubble caused by he flow of water through the said branch tubes, the-flow through the main pipe is calculated.

Referring to the drawings,

Figure'l shows a hydrant equipped with Fmrin A water meter.

Fig. 2 is a horizontal section of the front plate showing the scale contained thereon and also the construction of the WlIldOW. having a glass plate inserted.

Fig.3 is a plan view of Fig. 1.

Fig. l is a front elevation of Fig. 3

as sectionedthrough plane AB, showing mainly the arrangementof the branch tubes and the water box.

Fig. 5 isa plan View of Fig. 1 as cut by a plane CD. I

Fig. 6 is an elevation of Fig. 5 as out through by a plane E-E, principally showmg the water box, the float arranged therein, and the deviceautomatically indicating the motion of said float.

Fig. 7 is a side elevation of Fig. 5 ascut by a plane through O-O, and illustrates the arrangement of the water box, toothed wheel, grooved pulley,scale disk, and the needle pointer.

Fig. 8 shows a general view of Form B water meter.

pipe.

Figs. 10,11 tions of the'principles of the water meters.

As illustrated in'Figs. 10 and 11 in Form A water meter when a branch tube is in- Fig. 9 is a vertical section of the drain and 12 are graphic illustrasorted into the mainpipe M,'which has two different cross-sectional areas like a 'and a, there is established a head of water in the branch tube COITGSPOIlCllIlgtO the difference in velocity heads as caused by the dillerence in the sectional area ofthemain pipe. When the main pipe-is held in a fixed position,

and. the free end of the branch tube isgradu= I ally lowered, a portion of the water flowing through the main pipe will run into the said branch tube, and, if the outlet of the branch tube is held in the proper position, the ratio of flowthrough the main pipe to that through the branch tube may be determined.

As illustrated in Fig. 12, in Form B water meter, when two branch tubes are provided respectively at two points of the'main pipe having two dilferent sectional areas like 60 and a and-the free ends out the tube are,

connected by another small tube, water will.

flow through the tubes due to the difference in head previously described. By forcing a fixed volume of air bubble into the branch tube,and by giving the branch pipe a proper inclinatioin thcreby producing a head in the branch tube on accountof the rising tendency of the air bubble,the water flow through the main pipemay be made in direct proportion to the movement of the air.

bubble in said tube.

In either form, A or B, it is required to I as well aswith Form B, when equipped with a suitable water box, the water flow through the main pipe can be measured entirely with out use of mechanical indicating means.

In regard to the construction of the meters,In Form A water meter, as shown in Fig. 4, a is a cock and b the outlet of the main pipe m which is connected with said -cock and has two different sectional areas.

In the cock at is cut a cam slot 2' into which engages one end of a lever is, which is pivoted at 7' while the other end supports a spindle Z. m, is a link connecting Z with a, another spindle, which connects m with 0, the arm of a cock 2, such cook 10 controlling a branch tube T. T has a small aperture at penetrates the main pipe on at T connects with a connecting tube r through the cock p, and then joins with a tube 8. The other end of tube .9 is left open. 4) is a small iron tank with a port to receive water flowing out from s. In one corner of the iron tank 4) there is a chamber B (see Figs. 5 and'G). In chamber B is a float A constructed of iron, and the chamber B is connected with the tank '21 at the lower part. On top of the float A is aplug C (Fig. 6), which has a pivot D'supporting a rod E having projections M and G. Above the tank o (Figs. 5, 6, and 7) there are fixed a toothed wheel a I and a grooved pulley y, both of which are supported on a common shaft 2, which in turn is carried by bearing pedestals S rigidly mounted'on top of the water box. I (Figs. 5 and 6) is an empty cylinder completely separated from the tank, and therein hangs a plumb weight P which is suspended by 'a string Q, the other end of which'is wound around the grooved pulley 3 A pawl J issupported by a pivot fixed on top of the water box, and has its other end engaged with the toothed wheel at it, thus completely checking the right hand rotation of the wheel. The shaft 2 extends through a recess portion of the casing c, and is provided with an indicating hand 6 which moves in front of a scale disk cl, as shown in Figs. 1 and 7.

The front wall of the chamber B in the tank n and the front wall of the casing 0 have portions cut out as illustrated in Fig. 2, and glass plates 71, and f are inserted therein, thereby preventing leakage of water from the water tank, and at the same time enabling observation from outside of themotion of the float contained in the chamber.

N ow the operation of the meter is .as followsr i N First referring to Fig. 4, when the cook a 'phere at some lower level.

is opened water commences to flow through the main pipe M toward Z) and at the same instant, due to the action of the lever 76, the cock 3? is opened. A small quantity of water flows into the tank 4) from the branch tube T at the same time as the water flows out from I). As the water level in '0 gradually rises, the float A also rises, that is, the latter rises in proportion to the quantity of water discharged from 5. Therefore the flow through the main pipe is calculated from the reading of the amount of water in the watertank by means of a reference line marked on the front face of the float and the scale illustrated in Figs. 1 and 2. Whenthe water level in the water tank further rises and reaches its highest point, the'rod E fixed ontop of the float also rises, keeping in contact with an iron guide strip F, and finally causes the projection m to engage with one of the teeth of the toothed wheel, at the same time emptying the water in the tank in a very short period of'time through a siphon W which has one end opened inside the water tank and the other end opened in the atmos- 7 Thus the level in the water tank suddenly descends, and, due to the weight of the float, the toothed wheel turns to the extent of one tooth, at the same time disengaging the projection m from the toothed wheel by the action of the other projection G and an iron guide piece H (Fig. 6). The toothed wheel tends to reverse rotation' on, account of the weight P, but it stops, being opposed by the. rod J. The retation of the toothed wheel is transmitted to the indicating hand 6 (Fig. 7),.and enables one to read'the same on the. scaled disk shown in Fig. 1. Thus, since the product of the number. of times the tank hasbeen filled and the capacity of said tank, plus the'actual amount of water left in the tank, is the quantity of flow through the branch tube, the corresponding flow through the main pipe can be immediately calculated. 'The capacity of the tank and the number of teeth of the toothed wheel may be made at will to suit: individual requirements, and the highest position of the float, or the highest level of the water in the tank, may alsobe regulated by pouring some water into the'float.

I In the Form B water meter, as shown in Fig. 8, m is the main, pipe with openings at two points 10 and 11, into which two glass or metallic tubes 12 and 13 are rigidly inserted. At the upper end of 12 is attached a valve 14; and connecting tube 15. On one side of 15 an airebubble inlet pipe 16 is provided, and to the upper end of the connecting tube is joined a spiral-shaped glass tube 17, the other end of which is fitted on to the connectingtube 13. 18.is a drain pipe, and 19 a valve in the connecting tube 13 so arranged as to operate in conjunction with mechanism composed of a slot 21 cut in the spindle of the cook 20, and 22,23, 24, 25,

and 26.

The meter of this form operates in the following manner W'hen the water in the main pipe line is discharged by opening the cook 20, there is produced a head and consequently a small portion oi? the water gradually flows into the spiral tube 17 through the branch tube 12. Then the branch tube '12'is completely lillectwith water, the closing otthe cock stops the flow in the branchtube. Now open the drain pipe 18, and at the same time slowly force the air, previously admitted from 27 by means of a piston 28 in the airbubble inlet pipe, intothe spiraltube until a bubble of a suitable volume is obtained. Then close the drain pipe 18. When the cook 20 is reopened the air bubble will ascend at a rate corresponding to the waterflow in the main pipe. The distance the air bubble travels may be measured by scale divisions on the spiral tube marked from a prevlous I thus the water flow 1n the experiment, and main pipe line canbe calculated.

The following is a mathematical demonstration that in the operation of the water meter the discharge through themain tube is directly proportional to the discharge through the branchtube. Reterenceis had to Figs. 10 to 12, inclusive, of the drawings.

According to the fundamental principle oi hydraulics V12 V22 V22 zf VE- 2V,

i -ital r en in which But therefore i H V. x C

2 as X0 1 O Q2 X K? Q2 01 0 C H=Q C (I) Take coordinate axes and plotting the in which value of g and H on abscissa andordinate 1 respectively. gram; The

See the accompanying d alocus showing the relatlon be tween g and H thus obtained is also a parab- 7 01a which may be expressed in which C is a certain constantand easily found by simple operation tromthe nature of the locus.

equation-(1) H Q XCQ' equation (11) Hzq 0 is obtained independent each other.

Now if in the enlarged portionot a main, f

discharginga cortainuamount of water as in Fig.10, a

equations (I) and (11) must hold true at the K constant;

branch tube be inserted,both

lVhen it is desired to move the air-bubble in the branch tube either forward or backward, the movement can easily be efiected by manipulating the air-bubble inlet pipe 16, valve 14, discharge pipe 18 andfvalve 19.

Claims.

1. A method oi discharging a constant proportionate quantity of fluid from a pipe which consists in creating back pressure of i the fluid in'the pipe and then discharging a portion of the fluid fromthe pipe at the point at which the back pressure is created.

2. A fluid meter comprising a main pipe having an enlarged section, and a branch pipe communicating with the main" pipe at the enlarged section, the nlet end of the said branch pipe facing in the direction 111 .Which the fluid flows through the main cpipei 3. A fluid meter comprising a main pipe having an enlarged P01431011 remote from elther end thereof, a branch pipe or uniform diameter extending into the main pipe and having its inlet end facing in the direction in Which-the fluid flows through the main pipe, said inlet end being located in the 7 said enlarged portion of the main pipe, and

n'ieans for measuring the flow of fiuld through the said branch pipe.

A fluid meter comprising a main pipe having V a'n'enlarged portion remote from eitherend thereof, a branch pipe of uniform diameterextending into the main pipe and two subscribing Witnesses.

t e-i3 9 having an inlet' end facing in the direction nain pipe, the outletjend of the branch pipe facing in, thedirection in which the fluid flows, and-,means for measuring the flow of fluid through the said branch pipe;

In testimony whereof I have signed my name to this specification in the presence of KATSUIZICHI MO'RI.

Vitnesses: V c p SHUNKICHI :KIMURA; A; 1*. CAH-UsAo. 

